Measuring instrument



W. H BRISTOL. MEASURING'INSTRUMENTI APPLICATION. FILED MAY 2.131s.

1 3 m6, Patented Oct. m, 1922...

ARA/V Patented or, W, 1922..

MEASURING INSTRUMENT.

Application filed May 2, 1918; Serial No. 231,986.

To all whom it may concern. sheet 11 for a pointer or measuring arm 12 Be it known that I, lVILLIAM H. BRISTOL, which is designed to move over same and aoitizen of the United States, and a resieffect an indicationor record, as is Well undent of l Vaterbui"y, in the county of New derstood.

aven and State of Connecticut, have in- The mechanism for actuating the measurvented certain new anduseful Improvements ing arm 12 comprises an expansible chamber in easuring Instruments, of which the fol- 13 secured at one end to the casing and made lowing is a specification. up of a series of perforated, superposed he invention relates to improvements in circular disks, for example of the character 65 instruments for measuring variations in set forth in my prior patent hereinbefore re 15 comprising anexpansible chamber, consistouter of these disks or diaphragms and free into a deflection y a plurality of yieldable pand and contract under the influence of the In the present invention, there is embodied scribed, and retained within a container 15.

airp anes, where an economy ofspace and mechanism, and in the other radially over lyingin the plane of deflection of the longito a plate attached to the casing 10. The

advantages enumeratedhereinbefore. ber, Which deflection will be communicated i5 pressure gage. in the intermediate mechanism, as shown, in

0 Fig. 2, looking in the direction of the arrows. mg in a cam slot 21 to transmit the movepressure, for example, instruments of the ferred to, the said chamber being designed type set forth in a prior Patent, No. 839,981, to receive the fluid whose variation in pres- 7 January, 1907, sure it is desired to measure. The measur- In this patent, an instrument is set forth ing arm 12 may be attached directly-to the mg of a plurality of flexible, circular diaend of the chamber, or preferably to a rigid phragms, whose motion in the direction of portion 14 thereof, substantially in the longiits longitudinal axis,due to expansion and tudinal axis of the said chamber, and along contraction of said diaphragms, is converted which axis the chamber is designed to exmeans, such as two flat springs, the faces of pressure variations of the fluid introduced which lie in a common plane at right angles therein.

to the plane of deflection of the said longi- It is desirable, however, to include suit tudinal axis of the expansible chamber. able multiplying mechanism, hereinafter de deflection and without lag, the said means as a flat spring 17 whose other end is fixed tudinal axis of the expansible chamber. purpose of this restraining means is to con- While this construction may reduce somevert the longitudinal movement of the exwhat the direct deflection of the device, yet pansible chamber, due to introduction of this slight sacrifice is more than offset by the fluid therein into a deflection of said chamhe nature of the invention will be best to the measuring arm through the rod 16 understood when described in connection rigidly secured to portion 14 of said chamwith the accompanying drawings, in which--- her and the intermediate multiplying mecha- Fig. 1 is. a front elevation of the improved nism. A counterweight 18 may be included Fig. 2 is a horizontal section through the order to render the instrument suitable for instrument casing, the mechanism being use in' any position. Movement of rod 16 is shown in full. communicated to a rock shaft 19 and the lat- Fig. 3 is a section taken on the line 3+8, ter is connected with a ball shaft 20 operat- Similar characters of referencedesignate ment to the pointer 12 through the intercorresponding parts throughout the several mediate gearing22. The flat strip 17 is so views. located with reference to the series of diathrough the said rod; and to insure a definite direction of deflection, the plane of its face is perpendicular to a radius of the disks, or rather to the plane of deflection of the longitudinal axis of the disks. The use of a flat spring in this manner greatly simplifies the construction, materially reduces the size an thereby weight of the device, and accurately determines the direction of deflection, and is quite suflicient to insure against any lag in the action of the diaphragms.

I claim:

1. In a pressure gage: a casing; a series of perforated superposed circular disks forming an expansible chamber secured at one end to said casing and the outer disk of the other end of said series being provided with a rigid p ortion substantially in its longitudinal axis, said disks forming a chamber adapted to expand and contract in the direction of its longitudinal axis in accordance with variations of pressure of fluid intro- ;luced therein; indicating means actuated from said rigid portion; and flexible restraining means rigidly secured at one end to the casing, and means connecting the other end thereof with said rigid portion of the upper disk, said restraining means being otherwise entirely free and clear of the said disks and being yieldable only in the plane of deflection of the longitudinal axis of said chamber, to restrain the motion of the chamber and convert the same into a deflection of its said longitudinal axis.

2. In a pressure gage: a casing; a series of perforated, superposed, circular disks forming an expansible chamber secured at one end to said casing and the outer disk of the other end of said series being provided with a rigid portion substantially in its longitudinal axis, said disks :tornnng a chamber adapted to expand and contract in the direction of its longitudinal axis in accordance with variations of pressure of fluid introduced therein; indicating means actuated from said rigid portion; and a flat strip rigidly secured at one end to the casing, and. means connecting the other end thereof with said rigid portion 01 the upper disk, said strip being otherwise entirely free and clear of the said disks and lying in a plane at right angles to the plane oi deflection of the longitudinal axis of said chamber and being yieldable only in the plane of deflection ot' the longitudinal axis of said chamber, to restrain the motion of the chamber and convert the same into a deflection of: its said longitudinal axis.

Signed at New York, in the county of New York and State of New York, this 26th day of April, A. D. 1918.

Wllil JIA M H. nms'rtm. 

